1922] 



PFEIFFER MONOGRAPH OF THE ISOETACEAE 179 



location, September 16, 1902, Eaton (Mo. Bot. Gard. 

 Herb.). 



New Jersey: Morris Pond, 11 September, 1890, Britton (N. Y. 

 Bot. Gard. Herb.) ; in water 1 ft. deep, Morris Pond, 14 

 September, 1887, Britton (N. Y. Bot. Gard. Herb.). 



47. I. saccharata Engelm. in Gray, Manual, ed. 5, 676. 1867 ; 

 Baker, Jour. Bot. 18: 69. 1880; Motel. & Vendr. Actes Soc. 

 Linn. Bord. 36 : 356. 1883 ; Engelm. Trans. St. Louis Acad. Sci. 

 4: 382. 1882; Eaton in Gray, Manual, ed. 7, 60. 1908; Maxon 

 in Britton and Brown, 111. Fl. 1: 52. 1913. 



/. saccharata var. Palmeri Eaton, Proc. Biol. Soc. Wash. 14: 

 49. 1901. 



I. saccharata var. reticulata Eaton, Proc. Biol. Soc. Wash. 

 14: 49. 1901. 



Calamaria saccharata Kuntze, Rev. Gen. PL 2 : 828. 1891-93. 

 Corm 2-lobed, small, much flattened; leaves 8-25, rarely 40, 

 6-15 cm. long, slender, curved, olive-green, with membranaceous 

 margin at base, soon disappearing above; stomata numerous; 

 peripheral strands none; ligule small, cordate at base; sporan- 

 gium small, 3-5 mm. long, almost as wide as long, with narrow 

 velum (covering less than 1/5 of sporangium) ; megaspores 

 white, 400-520 M in diameter, marked with very irregular, 

 crowded, more or less discontinuous ridges with prominences 

 somewhat blunt or granular; microspores 23-29 n long (rarely 

 32), almost smooth. 



Distribution: Delaware, Maryland, District of Columbia / Vir- 

 ginia. 



Specimens examined: 



Delaware: near Seaford, shores of Nanticoke River, Sussex Co., 

 August, 1874, Canby (Mo. Bot. Gard. Herb., Gray Herb., 

 and U. S. Nat. Herb.). 



Maryland: on tidal mud, Salisbury, shores of Wicomico River, 

 28 August, 1867, Canby (Mo. Bot. Gard. Herb, and U. S. 

 Nat. Herb.), TYPE; shores of Wicomico River below Salis- 

 bury, 8 September, 1866, Canby (Mo. Bot. Gard. Herb, and 

 Gray Herb.) ; tidal mud, Salisbury, 28 August, 1867, Canby 

 (Mo. Bot. Gard. Herb, and U. S. Nat. Herb.) ; shore of Wico- 

 mico River near Salisbury, 1 September, 1867, Canby (Gray 

 Herb.); gravelly shore of Wicomico River, Salisbury, 1 Oc- 



